app/utils/bodyLinks.ts, pure and run by content layers at SSR on
sanitized body HTML (UI-SPEC L7 steps 2 to 4):
- autolink(html, links, max, self): first occurrence of each CMS phrase,
whole words, case-insensitive, at most max per text, never inside a,
headings, code, pre, figcaption or button, never to the page itself;
only site paths and http(s) URLs, escaped, as a plain <a href>
- applyOutbound(html, {siteHost, newTab, nofollowDomains,
sponsoredDomains, hint}): editor rel kept, nofollow/sponsored from the
domain lists, target=_blank, rel noopener and the visually hidden hint
only while new tab is on; internal links untouched
- imageAttrs(html): loading=lazy and decoding=async, stored width,
height and alt="" kept
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